package com.remark.utils;

import org.springframework.data.redis.core.StringRedisTemplate;
import org.springframework.stereotype.Component;

import javax.annotation.Resource;
import java.time.LocalDateTime;
import java.time.ZoneOffset;
import java.time.format.DateTimeFormatter;

@Component
public class RedisIdWorker {
    //当前时间戳
    private static final long BEGIN_TIMESTAMP=1735689600L;
    //序列号的位数
    private static final int COUNT_BITS=32;

    @Resource
    private StringRedisTemplate stringRedisTemplate;

    public long nextId(String keyPrefix){
        //1.生成时间戳
        LocalDateTime now=LocalDateTime.now();
        long timeStamp=now.toEpochSecond(ZoneOffset.UTC)-BEGIN_TIMESTAMP;
        //2.生成序列号
        //2.1获取当前日期，精确到天
        String date=now.format(DateTimeFormatter.ofPattern("yyyy:MM:dd"));
        //2.2自增长
        long count =stringRedisTemplate.opsForValue().increment("icr:"+keyPrefix + ":" + date);
        //3.拼接并返回
        return timeStamp<<COUNT_BITS|count;//先向左移32位，那么低32位全为0，跟序列号进行或操作
    }

}
